How many types of nucleotides are found in
DNA molecules?
a. 1
b. 2
c. 3
d. 4
e. 6
D
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Which one of the following statements about the denaturation of nucleic acids is true?
A. Increasing the temperature will allow the DNA to renature. B. Returning the pH to 7 will allow the DNA to denature. C. Reducing the temperature will often allow a denatured DNA to renature. D. Increasing pH allows annealing of RNA strands. E. Since RNA is only partially double-stranded it is unaffected by changes in pH and temperature.
The outer membrane of Gram-negative bacteria
A) is a rigid, protective outer shell. B) is also referred to as endotoxin and stimulates fever and shock. C) is the site of nutrient exchange and allows sizes and shapes of molecules to pass through it. D) has the same chemical composition as the cell membrane.
During prophase II, ____.
A. a new spindle forms B. crossing over occurs C. chromosomes are single-stranded D. the cell is diploid E. the nuclear envelope re-forms
The (peroxide/superoxide/hydroxyl) radical is formed during the incomplete reduction of O2 during electron transport in aerobes
What will be an ideal response?